I have a binary array, and I would like to convert it into a list of integers, where each int is a row of the array.
For example:
from numpy import *
a = array([[1, 1, 0, 0], [0, 1, 0, 0], [0, 1, 1, 1], [1, 1, 1, 1]])
I would like to convert a
to [12, 4, 7, 15]
.
@SteveTjoa's answer is fine, but for kicks, here's a numpy one-liner:
In [19]: a
Out[19]:
array([[1, 1, 0, 0],
[0, 1, 0, 0],
[0, 1, 1, 1],
[1, 1, 1, 1]])
In [20]: a.dot(1 << arange(a.shape[-1] - 1, -1, -1))
Out[20]: array([12, 4, 7, 15])
(arange
is numpy.arange
.)
If the bits are in the opposite order, change the order of the values produced by arange
:
In [25]: a.dot(1 << arange(a.shape[-1]))
Out[25]: array([ 3, 2, 14, 15])
I once asked a similar question here. Here was my answer, adapted for your question:
def bool2int(x):
y = 0
for i,j in enumerate(x):
y += j<<i
return y
In [20]: a
Out[20]:
array([[1, 1, 0, 0],
[0, 1, 0, 0],
[0, 1, 1, 1],
[1, 1, 1, 1]])
In [21]: [bool2int(x[::-1]) for x in a]
Out[21]: [12, 4, 7, 15]
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